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How many times does a FreeBSD buildworld/buildkernel/installkernel open each file and what are the file names?

Run the command: $dtrace -o /tmp/log -n open:entry'{@[copyinstr(arg0)] = count()}'

And in another command shell run: $make buildworld && make buildkernel && make installkernel

When the build completes, type Ctrl-C in the dtrace window and look at /tmp/log

So which 3 files were opened the most often and how many times?

Answer (last 1000 lines of the 16 MB output file):

  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/ioccom.h             4604
  ./sys/unistd.h                                                 4651
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/netinet/in.h             4723
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/netinet6/in6.h             4723
  ./sys/limits.h                                                 4789
  ./errno.h                                                      4845
  ./stdarg.h                                                     4925
  @/sys/systm.h                                                  4946
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/socket.h             5111
  ./sys/queue.h                                                  5174
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/stat.h             5285
  ./sys/stdint.h                                                 5368
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/_iovec.h             5377
  ./stdio.h                                                      5442
  ./machine/_stdint.h                                            5524
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/fcntl.h             5651
  ./stdlib.h                                                     5754
  ./string.h                                                     5806
  ./strings.h                                                    5806
  ./sys/signal.h                                                 5839
  ./machine/signal.h                                             5861
  ./machine/trap.h                                               5907
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.prog.mk                5960
  ./machine/_limits.h                                            6113
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/ctype.h             6594
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/runetype.h             6646
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/_ctype.h             6648
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.man.mk                 6670
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/limits.h             7130
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/stddef.h             7266
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/param.h             7380
  ./sys/time.h                                                   7504
  ./sys/param.h                                                  7694
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.files.mk               7808
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.nls.mk                 7808
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.incs.mk                7818
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.libnames.mk             7854
  .depend                                                        7918
  ./sys/syslimits.h                                              8513
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/time.h             9037
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/signal.h             9183
  ./machine/param.h                                              9231
  ./sys/_timeval.h                                               9923
  ./sys/select.h                                                 9923
  ./sys/types.h                                                  9923
  ./sys/_pthreadtypes.h                                          9927
  ./sys/_sigset.h                                                9945
  ./machine/endian.h                                             9987
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/machine/trap.h            10034
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/machine/signal.h            10068
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.links.mk              10098
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.dep.mk                10144
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.sys.mk                10144
  ./sys/timespec.h                                              10163
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/stdarg.h            10377
  ./sys/_null.h                                                 10404
  ./sys/_types.h                                                10516
  ./sys/cdefs.h                                                 10546
  ./machine/_types.h                                            10580
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/syslimits.h            10581
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/limits.h            10613
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.obj.mk                10717
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/time.h            11240
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.subdir.mk             11487
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.cpu.mk                11513
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.dtrace.mk             11513
  /freebsd2/u2/p4/dtrace/src/share/mk                           11519
  /freebsd2/u2/p4/dtrace/src/share/mk/sys.mk                    11519
  /etc/make.conf                                                11559
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/unistd.h            11568
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/unistd.h            12111
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/errno.h            12651
  .                                                             13434
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/machine/param.h            13948
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/machine/_limits.h            14460
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/stdlib.h            15081
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/stdio.h            15354
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/string.h            15452
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/strings.h            15539
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/select.h            17189
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/_timeval.h            17250
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/_sigset.h            17398
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/types.h            17477
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/_pthreadtypes.h            17557
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/timespec.h            17764
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/machine/endian.h            19359
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/_null.h            19673
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/_types.h            20937
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.init.mk               22220
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/sys/cdefs.h            22728
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/machine/_types.h            22765
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.compat.mk             23000
  /freebsd2/u2/p4/dtrace/src/share/mk/bsd.own.mk                25172
  /lib/libedit.so.5                                             27266
  /lib/libncurses.so.6                                          27365
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/openssl/e_os2.h            30120
  /usr/obj/freebsd2/u2/p4/dtrace/src/tmp/usr/include/openssl/opensslconf.h            45805
  /etc/libmap.conf                                              53930
  /lib/libc.so.6                                                53930
  /var/run/ld-elf.so.hints                                      53930